Toggle press



June J. DERRY .TOGGLE PRESS Filed July 10. 1924 Patented June 21,1927.

UEJHTED STATES 1,633,31? PATENT OFFICE.

JASPER DERBY, OE MEDFORD, MASSACHUSETTS, ASSIGNOR TOANDREW TERKELSEN,

' OF BOSTON, MASSACHUSETTS. Y

TOGGLE rnn ss.

Application filed July 10,

This invention relates to toggle presses of the type shown and described inmyprior application filed February .18, 1924, Serial No. 693,478, and wherein mechanical means, preferably in the form of compression springs, are employed to exert a follow-up pressure on the ram after the toggle is straightened.

The present invention has for its objects to provide, in a press of this type, means whereby the follow-up pressure can be ad, justed, and also to provide means for measuring and indicating the amount of such pressure.

The more particular objects of the inven tion, together with means whereby the latter may be carried into effect, will best be understood from the following description of one form or embodiment thereof illustrated in the accompanying drawings. It will be understood, however, that the particular construction described and shown has been chosen for illustrative purposes merely, and that the invention, as defined by the claims hereunto appended, may be otherwise embodied without departure from the spirit' and scope thereof. 1

In said drawings:

Figs. 1 and 2 are a side and a front elevation respectively of a toggle press embodying the invention.

Fig. 3 is a section taken substantially on the line 33, Fig. 2.

As shown, the frame of the press comprises a pair of side uprights 10 supporting four upright posts 12 which in turn support, through adjustable nuts 14, the'bed plate 15 which carries the bed or stationary element of the press 16. The ram or co-operating movable element 17 is guided on the posts 12 and is operated by a toggle 18 interposed between said ram and a cross-head 19 slidably mounted on the posts 12 and normally supported by fixed collars or nuts 20 on said posts. The toggle 18 is straightened or broken to depress or lift the ram by means of a link 21 having rollers 22 co-operating with a cam 23 on a shaft 24 journalled in the uprights 10. The shaft 24: is rotated, through gearing generally indicated at 25, and under the control ofasuitable clutch 26, from a main power shaft 27 also journalled in the uprights 10 and adapted to receive power from any suitable source. The specific form of the particular driving connections is imconstitute adjustable 1924. Serial 1N0. 725,310.

material, and these may be of any suitable arrangement well known in the art.

In accordance with. the present invention, the posts. 12 are threaded at their upper ends to receive nuts 28 which may be adjusted upon said posts and may be secured in ad justed position by lock nuts 29. The nuts 28 abutments between which-and the cross-head 19 are interposed spiral springs 31 surrounding the posts. In the construction shown, washers 40 are interposed between the upper ends of the two rear springs 31 and the adjacent nuts 28, while in a correspol'iding position at thefront there is provided an auxiliary crossrhead 30 guided at its ends onthe two forward posts 12. 7

As inmyprior application above referred to, the, springs 31 are collectively of a strength sufficient to transmit, without yielding, forces less than the maximum'pressure to be exerted by the press but to yield when said pressure is reached. The strength of said springs, and consequently the forces transmitted thereby without yielding, isdetermined by the initial compression to which said springs are subjected, and this pressure can, in accordance with the present invention, be readily varied by adjustment of the nuts 28. In order that this pressure may be readily measured and indicated, the crosshead 19 is provided with a graduated dial 32 with which co-operates a pointer 33 carried by a pinion 34 rotatably mounted on said cross-head and cooperating with a rack 35 depending from the auxiliary cross-head 30. The rack 35 is preferably adjustably connected with the auxiliary cross-head 30 by means of nuts 36 on the threaded stem of said rack which extends through an opening in said cross-head, the adjustment of the nuts 36 serving to calibrate the indicator. It will thus be seen that the relative movement of the cross-heads 19 and'30 incidental to compression or expansion of the springs 31 will be indicated by the pointer 33 on the dial 32.

The operation of the press above described is substantially as explained in my prior application above referred to. The bed plate 15 is so adjusted, in accordance with the dies (not shown) and the size of the work, that the latter is subjected to its maximum pressure by the ram 17 just prior to the straightening of the toggle 18 by the cam 23. When said maximum pressure is reached, the springs 31 yield, permitting said toggle to be completely straightened. Themaximum pressure on the work isthereby maintained by said springs, and after the material contracts, said springs expand to exert a followup pressure thereon. Theextent of the pressure is determined by the initial adjustment of the nuts 28 and is indicated by the pointer 33 on the dial 32, the variations in pres's'ureincidental to the operation of the ram'and the subsequent contraction of thematerialbeing readily followed by the operator by observation of the indicator. 7

"Having thus described my invention, I claim:

1. "In 'a press, in combination, a ram, a toggle for operating said ram, means for straightening said toggle, mechanical means for exerting a follow up pres'su'reiipon'said ram after saidtoggle is straigntened, and means for measuring and indicating the amount of said pressure.

'2. In a press, in combination, a ram. an

adjustable abutment, a toggle interposed-be tween said ram and abutment, a spring throughwhich saidtoggle reacts upon said abutment,'-means 'for measuring and indicating thetension of said spring, and means for strai'ghtening'said toggle.

3. In a press, in combination, an abutmerit, a movable head, a spring interposed between said abutment and head, a ram, a toggle interposed between said ram and head, 'means for straightening said toggle,

and means for measuring and indicating the relative movement of said abutment and head.

4c. In a press, in combination, an adjustableabutment, a vmovable head, a spring interposedbetween said abutment and head, a ram, a toggle interposed between said ram and head, means for straightening said togsaid "frame'me'm'bers, cross-heads guided said'frame members,'one of said cross heads engaging said ab'utments, a toggle interposed betw'eenthe other of said'cross he'ads and said "ramymeans fors'traightening 'said toggle, springs interposed between said crossheads, a pinion carried by the other of said cross-heads and cooperating withsaid'rack, and an indicator operated by said pinion.

V '6. Ina press, in combination, frame members having adjustable abutmentsfa ram guided by'sai'd frame members, cross-heads guided'by said frame membersyoneof-said cross heads' engaging said "abutments, a toggle interposed' between the other of said cross-heads andsaid ram, meansfor-straight' ening said toggle,'-springs i liter-posed between said cross-heads,a rack carried by'one'of said cross-heads, 'apinion carried by the Other of said "cross heads and icooperating with said rack, and an indicator operated'by said pinion. I

In testimo'nywhereof "I aflix my signature;

JASPER -DE-RRY.

heads, a rack'carried by one of said c'ross- 

